Looking Good Laser Security Alarm Circuit Diagram

The laser beam illuminates the face of photo transistor and starts conducting the voltage.

Laser security alarm circuit diagram. Laser security system circuit diagram and explanation. Take a permanent marker and make a rough layout or path draw on your pcb as shown in figure 1. The attached schematic should demonstrate how the parts come together.

Your laser security alarm system is now. Ldr light dependent resistor connected to the base terminal of q2 transistor through r4 resistor. At the opposite door frame receiver should be fixed and should be properly aligned to the laser beam.

Schematic circuit diagram of the laser light security alarm system step 2. Focus the laser diode light on the ldr and you will see the l e d and buzzer going off if you interrupt the laser light focusing on the ldr the circuit will trigger and the alarm will ring. How it works referring to circuit diagram it is seen that a tl072 op amp ic1 a is configured as a voltage comparator placed in between the adjustable voltage driver p1 r4 and the light dependent voltage which consists of photodiode d1 and r3 a fixed resistor.

Experimental setup 1 connect a photocell to a 5k resistor. In this laser security alarm circuit we have used lm358 dual comparator ic for comparing voltages coming from ldr. Construction testing step 1.

A security alarm i e. The circuit can be used as a laser door alarm laser motion detector laser proximity sensor trip wire alarm and for other simple home security purposes. Instead of pushing the car central lock instrument it will dial my number thru a gsm cell phone.

As soon as you connect the battery the l e d and buzzer will come on if you re in a dark room. Working of laser security system lock along with circuit diagram non inverting input receives a variable voltage based on the conduction of t1. An ldr is used for detecting light or laser light with respect to ground through a 10k resistor.